What are the differences between the past tense, perfect, imperfect or pluperfect?
There are three tenses which make up the past tense: the perfect tense; the imperfect tense; and the pluperfect tense.
The perfect tense: this is used when you are referring to an action which happened only once in the past. It is an action which was completed in the past:
I booked my holiday.
Last month, I bought a ...